400004044400 has 60 divisors (see below), whose sum is σ = 969514336992. Its totient is φ = 158585656320.

The previous prime is 400004044397. The next prime is 400004044421. The reversal of 400004044400 is 4440400004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4379624 + ... + 4470023.

Almost surely, 2^400004044400 is an apocalyptic number.

400004044400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400004044400 is an abundant number, since it is smaller than the sum of its proper divisors (569510292592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400004044400 is a wasteful number, since it uses less digits than its factorization.

400004044400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8849778 (or 8849767 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 400004044400 its reverse (4440400004), we get a palindrome (404444444404).

The spelling of 400004044400 in words is "four hundred billion, four million, forty-four thousand, four hundred".